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[3.14] gh-140513: Fail to compile if _Py_TAIL_CALL_INTERP is set but preserve_none and musttail do not exist (GH-140548) (#140923)

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gh-140513: Fail to compile if `_Py_TAIL_CALL_INTERP` is set but `preserve_none` and `musttail` do not exist. (GH-140548)


(cherry picked from commit 2f60b8f02f)

Co-authored-by: Krishna Chaitanya <141550576+XChaitanyaX@users.noreply.github.com>
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Chris Eibl 2025-11-04 21:43:18 +01:00 • committed by GitHub
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commit f0eb7d4c9a
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8
Python/ceval_macros.h
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@ -79,6 +79,14 @@
#endif
#if Py_TAIL_CALL_INTERP
# if defined(__clang__) || defined(__GNUC__)
# if !_Py__has_attribute(preserve_none) || !_Py__has_attribute(musttail)
# error "This compiler does not have support for efficient tail calling."
# endif
# elif defined(_MSC_VER)
# error "Tail calling not supported for MSVC."
# endif
// Note: [[clang::musttail]] works for GCC 15, but not __attribute__((musttail)) at the moment.
# define Py_MUSTTAIL [[clang::musttail]]
# define Py_PRESERVE_NONE_CC __attribute__((preserve_none))